/*-------------------------------------------------------------------------
 *
 * pathnode.h
 *	  prototypes for pathnode.c, relnode.c.
 *
 *
 * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $Id: pathnode.h,v 1.30 2000/10/05 19:48:33 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef PATHNODE_H
#define PATHNODE_H

#include "nodes/relation.h"

/*
 * prototypes for pathnode.c
 */
extern int compare_path_costs(Path *path1, Path *path2,
				   CostSelector criterion);
extern int compare_fractional_path_costs(Path *path1, Path *path2,
							  double fraction);
extern void set_cheapest(RelOptInfo *parent_rel);
extern void add_path(RelOptInfo *parent_rel, Path *new_path);

extern Path *create_seqscan_path(RelOptInfo *rel);
extern IndexPath *create_index_path(Query *root, RelOptInfo *rel,
				  IndexOptInfo *index,
				  List *restriction_clauses,
				  ScanDirection indexscandir);
extern TidPath *create_tidscan_path(RelOptInfo *rel, List *tideval);
extern Path *create_subqueryscan_path(RelOptInfo *rel);

extern NestPath *create_nestloop_path(RelOptInfo *joinrel,
									  JoinType jointype,
									  Path *outer_path,
									  Path *inner_path,
									  List *restrict_clauses,
									  List *pathkeys);

extern MergePath *create_mergejoin_path(RelOptInfo *joinrel,
										JoinType jointype,
										Path *outer_path,
										Path *inner_path,
										List *restrict_clauses,
										List *pathkeys,
										List *mergeclauses,
										List *outersortkeys,
										List *innersortkeys);

extern HashPath *create_hashjoin_path(RelOptInfo *joinrel,
									  JoinType jointype,
									  Path *outer_path,
									  Path *inner_path,
									  List *restrict_clauses,
									  List *hashclauses,
									  Selectivity innerdispersion);

/*
 * prototypes for relnode.c
 */
extern RelOptInfo *get_base_rel(Query *root, int relid);
extern RelOptInfo *get_join_rel(Query *root, RelOptInfo *outer_rel,
			 RelOptInfo *inner_rel,
			 List **restrictlist_ptr);

#endif	 /* PATHNODE_H */
